Jim.... My main concern would be the end product requirement for the trace, which I believe should be its final cross sectional area and relationship between its current carrying capacity and intented use. Therefore, I would consider this to be a 6.0 mil finished line in my calculations for end product requirements and let the pundits debate how to measure the trace. Bob Vanech Bob Vanech Norden Systems Norwalk, Ct. (203) 852-4810